In this example, I’ll use Zoom, but it will be much the same for any meeting platform that allows SfB SIP URI dial-in. The username is the prefix of the host’s room video address, in the format of For a scheduled meeting: (For example, For a Personal Room meeting: (For example, details here Dialling the Skype for Business SIP address from Microsoft Teams to join a Zoom Meeting.In Webex, there is a special format SIP URI you can dial, In Zoom, it is an option that the person inviting you to the meeting has to enable. How do Zoom and Webex meetings get a Skype for Business Join SIP URI? Unfortunately, most Teams users won’t know what “mode” they are in. This works via federation, so you need to be in Teams Only mode (which allows federation) and have federation enabled. You are probably better joining with the native client for those platforms. Still, interestingly you can dial this SfB SIP URI from Microsoft Teams to join the Zoom or Webex or another platform meeting. It’s not the slickest user experience and not something I would necessarily recommend. Many popular meetings platforms like Zoom and Webex have an option to add a SIP Address for Skype for business users to dial directly into the meeting from the Skype for Business client.

Zoom cloud meeting how to use dial in